What causes your eye to twitch?

Fatigue, dryness: Common causes for a funny little eyelid twitch include surface irritation of the eye (such as dryness) and fatigue. If both eyes are twitching, that's something different (usually blepharospasm), and can be treated with botox. If not just the eye but the side of the face is twitching, see your eye care provider, as a small percentage of people with this symptom need an MRI to r/o a problem ...

Cause is uncertain: Trembling of an eyelid, which happens in normal people, is called myokymia (an involuntary, spontaneous, quivering of a few muscle cell bundles within a muscle). Myokymia starts and stops spontaneously. In the eyelids, it can last a few minutes to a few days. One should see an ophthalmologist (md eye doctor) if such symptoms persist, keep recurring, or are combined with any other symptoms.

Stress: You are describing myokymia - an involuntary twitching of the skin around the eyelids. It's believed to be related to lack of sleep, stress, and caffeine use. Change these risk factors and it should abate.

Myokymia: Most eyelid twitches are due to myokymia. This is a benign condition which generally lasts 2-4 weeks. It is caused by lack of sleep, caffeine use and stress.